Argument exception after trying to use TryGetObjectByKey

Posted by Rickjaah on Stack Overflow See other posts from Stack Overflow or by Rickjaah
Published on 2010-04-26T12:51:28Z Indexed on 2010/04/26 12:53 UTC
Read the original article Hit count: 737

Filed under:

.NET

Hi,

I'm trying to retrieve an object from my database using entity (framework 4) When I use the following code it gives an ArgumentException: An item with the same key has already been added.

    if (databaseContext.TryGetObjectByKey(entityKey, out result))
    {
        return (result != null && result is TEntityObject) ? result as TEntityObject : null;
    }
    else
    {
        return null;
    }

When I check the objectContext, I see the entities, but only if I enumerate the specific list of entities manually using VS2010, it works.

What am I missing? Do I have to do something else before i can get the item from the database? I have lazy loading set to true.

I searched google, but could not find any results, the same for the msdn library

Argument exception after trying to use TryGetObjectByKey

Posted by Rickjaah on Stack Overflow See other posts from Stack Overflow or by Rickjaah
Published on 2010-04-23T15:27:02Z Indexed on 2010/04/26 13:53 UTC
Read the original article Hit count: 737

Filed under:

.NET

Hi,

EDIT: Somethings wrong.... I have to use objectContext.Frontpages.ToArray() before I can use TryGetObjectByEntityKey(). Any ideas anyone?

I'm trying to retrieve an object from my database using entity (framework 4) When I use the following code it gives an ArgumentException: An item with the same key has already been added.

        if (databaseContext.TryGetObjectByKey(entityKey, out result))
        {
            return (result != null && result is TEntityObject) ? result as TEntityObject : null;
        }
        else
        {
            return null;
        }

When I check the objectContext, I see the entities, but only if I enumerate the specific list of entities manually using VS2010, it works.

What am I missing? Do I have to do something else before i can get the item from the database?

I searched google, but could not find any results, the same for the msdn library

EDIT: Still working on this.... It's a weird problem. I retrieve a value, but get an error that says a duplicate item exists.

STACKTRACE:

[ArgumentException: An item with the same key has already been added.] System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) +52 System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add) +9549131 System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadRelationshipTypes() +661 System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadTypesFromAssembly() +17 System.Data.Metadata.Edm.ObjectItemAssemblyLoader.Load() +25 System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.Load() +4 System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData) +160 System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, KnownAssembliesSet knownAssemblies, EdmItemCollection edmItemCollection, Action1 logLoadMessage, Object& loaderCookie, Dictionary2& typesInLoading, List1& errors) +166 System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(ObjectItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAssemblies, EdmItemCollection edmItemCollection, Action`1 logLoadMessage) +316 System.Data.Metadata.Edm.MetadataWorkspace.ImplicitLoadAssemblyForType(Type type, Assembly callingAssembly) +306 System.Data.Metadata.Edm.MetadataWorkspace.ImplicitLoadFromEntityType(EntityType type, Assembly callingAssembly) +109 System.Data.Objects.ObjectContext.TryGetObjectByKey(EntityKey key, Object& value) +288

EDIT: Lazy loading is set to true.

EDIT: Somethings wrong.... I have to use objectContext.Frontpages.ToArray() before I can use TryGetObjectByEntityKey(). Any ideas anyone?

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